Fly-eye lens and illumination optical device

1. A fly-eye lens comprising: an incident lens assemblage comprising a plurality of incident lenses that are aligned in a vertical direction, wherein each of the incident lenses has a quadrangular shape, wherein horizontal lens widths of the incident lens are the same, and wherein vertical lens widths of at least some of the incident lens are different from one another; and an emission lens assemblage comprising a plurality of emission lenses that are aligned in the vertical direction so as to be optically opposed to the incident lenses, wherein each of the emission lenses has a quadrangular shape, and wherein horizontal lens widths of the emission lenses lens are the same; wherein a dimension of the quadrangular shape of the incident lenses is set such that, on an illuminated surface, a preset illumination region is attained by a group of illumination ranges, each illuminated with light from one or more of the incident lenses, and wherein lens vertices of the incident lenses are eccentrically positioned such that light supplied by the incident lenses to the emission lenses is optically opposed to the incident lenses; and wherein a dimension of the quadrangular shape of the emission lenses is set and lens vertices of the emission lenses are positioned such that any of the plurality of illumination ranges forming the preset illumination region is attained, and such that at least part of the illumination ranges are overlapped with each other.

2. The fly-eye lens according to claim 1 , wherein: the incident lens assemblage comprises one or more incident lens rows that are adjacent in the vertical direction, each of the one or more incident lens rows comprising a plurality of the incident lenses that are aligned in the horizontal direction; the emission lens assemblage comprises one or more emission lens rows that are adjacent in the vertical direction, each of the one or more emission lens rows comprising a plurality of the emission lenses that are aligned in the horizontal direction; and any of the illumination ranges is illuminated with light from each of the rows of the emission lenses.

3. The fly-eye lens according to claim 1 , wherein: the incident lenses comprise: one or more first incident lens rows that are adjacent in the vertical direction, each of the one or more first incident lens rows comprising a plurality of first incident lenses that are aligned in the horizontal direction, and one or more second incident lens rows that are adjacent in the vertical direction, each of the one or more second incident lens rows comprising a plurality of second incident lenses that are aligned in the horizontal direction, wherein the one or more second incident lens rows are continuous with the one or more first incident lens rows, and wherein a vertical lens width of the second incident lenses is smaller in a vertical lens width of the first incident lenses; the emission lenses comprise: one or more first emission lens rows that are adjacent in the vertical direction, each of the one or more first emission lens rows comprising a plurality of first emission lenses that are aligned in the horizontal direction, and one or more second emission lens rows that are adjacent in the vertical direction, each of the one or more second emission lens rows comprising a plurality of second emission lenses that are aligned in the horizontal direction, wherein the one or more second emission lens rows are continuous with the one or more first emission lens rows; the illumination region includes a first illumination region illuminated with light emitted from the first emission lenses and a second illumination region illuminated with light emitted from the second emission lenses; and the lens vertices of the emission lenses are positioned so as to emit light, by each lens row, in the first illumination region or the second illumination region of the illumination range.

4. The fly-eye lens according to claim 3 , wherein: the first incident lenses and the second incident lenses each form a lens group by a preset number of the incident lens rows, the lens group has the quadrangular shape formed to illuminate any of the illumination ranges; the first emission lenses and the second emission lenses each form a lens group by a preset number of the emission lens rows, each emission lens of the lens groups has the lens vertices positioned so as to illuminate any of the illumination ranges; and a number of first incident lenses in the lens group of the first incident lenses is equal to a number of first emission lenses in the lens group of the first emission lenses, and a number of second incident lenses in the lens group of the second incident lenses is equal to a number of second emission lenses in the lens group of the second emission lenses.

5. The fly-eye lens according to claim 3 , wherein: the incident lens assemblage comprises: a first incident lens group and a second incident lens group that are adjacent in the vertical direction, wherein the first incident lens group comprises one or more first incident lens rows that are adjacent in the vertical direction, each of the one or more first incident lens rows comprising a plurality of the first incident lenses that are aligned in the horizontal direction, and wherein the second incident lens group comprises one or more second incident lens rows that are adjacent in the vertical direction, each of the one or more second incident lens rows comprising a plurality of the second incident lenses that are aligned in the horizontal direction, the emission lens assemblage comprises: a first emission lens group and a second emission lens group that are adjacent in the vertical direction, wherein the first emission lens group comprises one or more first emission lens rows that are adjacent in the vertical direction, each of the one or more first emission lens rows comprising a plurality of the first emission lenses that are aligned in the horizontal direction, and wherein the second emission lens group comprises one or more second emission lens rows that are adjacent in the vertical direction, each of the one or more second emission lens rows comprising a plurality of the second emission lenses that are aligned in the horizontal direction; a vertical lens width of the first incident lenses in the first incident lens group is different than a vertical lens width of the second incident lenses in the second incident lens group; (i) vertical lens widths of the second emission lenses in the second emission lens group are the same, or (ii) vertical lens widths of both the first emission lenses in the first emission lens group and the second emission lenses in the second emission lens group are the same; and a number of lens groups formed by the first incident lenses is the same as a number of lens groups formed by the first emission lenses, and a number of lens groups formed by the second incident lenses is the same as a number of lens groups formed by the second emission lenses.

6. The fly-eye lens according to claim 4 , wherein: the incident lens assemblage has the lens group of the first incident lens disposed on each of an upper side and a lower side with reference to the group of the second incident lenses in the vertical direction; and the emission lens assemblage has the lens group of the first emission lenses disposed on each of an upper side and a lower side with reference to the second emission lens in the vertical direction.

7. The fly-eye lens according to claim 4 , wherein: the incident lens assemblage has the lens group of the second incident lenses disposed on each of an upper side and a lower side with reference to the group of the first incident lenses; and the emission lens assemblage has the lens group of the second emission lenses disposed on each of an upper side and a lower side with reference to the group of the first emission lenses.

8. The fly-eye lens according to claim 4 , wherein: the lens groups of the second incident lenses aligned in the vertical direction is greater in number than the lens groups of the first incident lenses; and the lens groups of the second emission lenses aligned in the vertical direction is greater in number than the lens groups of the first emission lenses.

9. The fly-eye lens according to claim 4 , wherein: among a plurality of lens groups of the second incident lenses aligned in the vertical direction, at least one lens group is different in number of lens rows from other lens groups; among a plurality of lens groups of the second emission lenses aligned in the vertical direction, at least one lens group is different in number of lens rows from other lens groups; and the group of the second incident lenses and the group of the second emission lenses differing in the number of lens rows are optically opposed to each other, and the same as each other in the difference in the number of the lens rows.

10. The fly-eye lens according to claim 3 , wherein lens vertices of the second emission lenses are eccentrically positioned such that the second illumination region has vertical symmetry with respect to a center of the first illumination region.

11. The fly-eye lens according to claim 3 , wherein lens vertices of the second emission lenses emitting light in the second illumination region are eccentrically positioned so as to attain a light illumination intensity distribution of the second illumination region in which a light illumination intensity is higher around a center and lower toward a periphery of the whole second illumination region.

12. The fly-eye lens according to claim 3 , wherein: in the incident lens assemblage, a shape of a lens surface obtained by connecting lens vertices of the first incident lenses and the second incident lenses is parallel to the horizontal direction and one of a concave surface and a convex surface in the vertical direction; and in the emission lens assemblage, the first emission lenses and the second emission lenses are connected to each other to form a curved surface substantially parallel to the incident lens assemblage.

13. The fly-eye lens according to claim 3 , wherein: lens vertices of the first emission lenses are eccentrically positioned such that a preset light illumination intensity distribution is attained in the first illumination region by the first emission lenses emitting light in different illumination ranges in the first illumination region for each lens row; and lens vertices of the second emission lenses are eccentrically positioned such that a preset light illumination intensity distribution is attained in the second illumination region by the second emission lenses emitting light in different illumination ranges in the second illumination region for each lens row.

14. The fly-eye lens according to claim 3 , wherein: lens vertices of the first emission lenses are eccentrically positioned so as to emit light in the first illumination region for each section in the horizontal direction for each aligned lens row; and lens vertices of the second emission lenses are eccentrically positioned so as to emit light in the second illumination region for each section in the horizontal direction for each aligned lens row.

15. The fly-eye lens according to claim 3 , wherein lens vertices in the lens rows of the emission lens are eccentrically positioned such that, in the first illumination region or in the second illumination region, the first illumination region or the second illumination region is formed by a group of illumination ranges that become greater in the horizontal direction toward a lens surface center in the vertical direction.

16. The fly-eye lens according to claim 3 , wherein: the first illumination region is formed of, in a whole illumination region being set, a group of regions illuminated at different locations with light emitted from rows of the first emission lenses, which regions are the same as one another in a vertical region size and differ from one another in a horizontal region size; and the second illumination region is formed of, in the whole illumination region, a group of regions being illuminated at different locations with light emitted from rows of the second emission lenses, which regions differ from one another in the vertical region size and the same as one another in the horizontal region size.

17. The fly-eye lens according to claim 3 , wherein: the first illumination region is formed of, in a whole illumination region being set, a group of regions being illuminated at different locations with light emitted from rows of the first emission lenses, which regions are the same as one another in a vertical region size and a horizontal region size; and the second illumination region is formed of, in the whole illumination region being set, a group of regions being illuminated at different locations with light emitted from rows of the second emission lenses, which regions are the same in the vertical region size and the horizontal region size.

18. A fly-eye lens comprising: an incident lens assemblage comprising a plurality of first incident lenses that have a quadrangular shape and a plurality of second incident lenses that have a quadrangular shape, wherein a horizontal lens width of the second incident lenses is the same as a horizontal lens width of the first incident lenses, wherein a vertical lens width of the second incident lenses is smaller than a vertical lens width of the first incident lenses, and wherein the first incident lenses and the second incident lenses are aligned in a vertical direction and a horizontal direction with their horizontal lens widths being the same in a vertical column; and an emission lens assemblage comprising a plurality of first emission lenses that have a quadrangular shape and that are optically opposed to the first incident lenses, and a plurality of second emission lenses that have a quadrangular shape and that are optically opposed to the second incident lenses, the first emission lenses and the second emission lenses being aligned in the vertical direction and the horizontal direction with their horizontal lens width being the same in a vertical column; wherein a dimension of the quadrangular shape of first incident lenses is set such that, on an illuminated surface, a preset first illumination region is attained, and wherein lens vertices of the first incident lenses are positioned such that light supplied by the first incident lenses to the first emission lenses is optically opposed to the first incident lenses; wherein a dimension of the quadrangular shape of the second incident lenses is set such that a preset second illumination region is obtained, an area of the second illumination region being smaller than an area of the first illumination region, and the second illumination region being at least partially overlapped on the first illumination region on the illuminated surface, and wherein lens vertices of the second incident lenses are positioned such that light supplied by the second incident lenses to the second emission lenses is optically opposed to the second incident lenses; wherein a dimension of the quadrangular shape of the first emission lenses is set and lens vertices of the first emission lenses are eccentrically positioned so as to emit light in the first illumination region; and a dimension of the quadrangular shape of the second emission lenses is set and lens vertices of the second emission lenses are positioned so as to emit light in the second illumination region.

19. An illumination optical device comprising: a first optical member disposed in an optical path from a light source and configured to convert light from the light source to a substantially collimated light beam; a fly-eye lens according to claim 18 , which is configured to receive light from the first optical member and emit the light with a gray scale distribution; a second optical member disposed in an optical path of the light from the fly-eye lens; a light modulation device configured to receive light from the second optical member and emit the light with its optical path changed; and a projection lens configured to project the light from the light modulation device.

20. The illumination optical device according to claim 19 , wherein the light source is a light emitting diode or a laser diode.

21. The illumination optical device according to claim 19 , wherein the first optical member is a collimating lens configured to convert light from the light source to a collimated light beam.

22. The illumination optical device according to claim 19 , wherein the first optical member is a reflecting mirror configured to reflect light from the light source to be a collimated light beam.